HDFS: How do you list files recursively?

Question

How do you, through Java, list all files (recursively) under a certain path in HDFS. I went through the API and noticed FileSystem.listFiles(Path,boolean) but it looks like that

Answer 1

You can look at the source for org.apache.hadoop.fs.FsShell.ls(FileStatus, FileSystem, boolean, boolean) for your version of hadoop - this is what is called when you perform a hadoop fs -lsr path from the command line

• 0.20.2 - line 593
• 1.0.2 - line 590

Answer 2

Use -R followed by ls command to list files/directorires recursively.

hadoop fs -ls -R Path/Of/File

Possible attributes for ls command are

-d : Directories are listed as plain files.

-h "Formats the sizes of files in a human-readable fashion rather than a number of bytes.

-R "Recursively list the contents of directories.

Answer 3

hadoop-user@hadoop-desk ~/hadoop
$ bin/hadoop fs -lsr /user/someone_else/myfiles

-rw-r--r--   1 hadoop-user supergroup          0 2013-11-26 02:09 /user/someone_else/myfiles/file1.txt

-rw-r--r--   1 hadoop-user supergroup          0 2013-11-26 02:09 /user/someone_else/myfiles/file2.txt

drwxr-xr-x   - hadoop-user supergroup          0 2013-11-26 02:09 /user/someone_else/myfiles/subdir

-rw-r--r--   1 hadoop-user supergroup          0 2013-11-26 02:09 /user/someone_else/myfiles/subdir/anotherFile.txt